Synonyms of conventional

1 Syllable

straight, preux, stock, p, clichéd, prim, plain

2 Syllables

plebeian, correct, wonted, rightwing, high-bred, banal, courtly, fairish, right-wing, prudish, starchier, square, starcher, cleanlier, stocker, usual, primmer, normal, blue-nose, cornfed, rightist, mainstream, current, proper, well-known, bourgeois, preppy, old-saw, formal, middling, old-line, preppies, ritual, starchy, triper, standard, common, hackneyed, uptight

3 Syllables

button-down, expected, general, reserved, statelier, typical, habitual, humorless, bluenose, working-class, popular, whitebread, undaring, unwritten, addicting, accepted, commonest, prevalent, white-bread, orderly, spic-and-span, parochial, orthodox, victorian, noplace, decorous, received, middleclass, familiar, stately, doctrinal, old-chestnut, prevailing, routine, regular, mediocre, punctilious, formulaic

4 Syllables

accustomed, tralatitious, self-controlled, self-restrained, commonplace, formalistic, stereotyped, time-honored, dime-a-dozen, ritualistic, fashionable, unrecorded, customary, overmodest, ordinary, liturgical, traditional, predominant, archetypal, everyday, buttoned-down, ceremonial, narrow-minded

5 Syllables

garden-variety, unexceptional, unimpressive, traditionalist, unoriginal, unnoteworthy, overconscientious, unformulated, well-established, conservative

6 Syllables

uncompanionable, ceremonialistic, traditionalistic

7 Syllables

ultra-conservative